Yes, but how much working solution I can make with two mini kits? The instrutions tells that to do a 250 ml solution, the various developer parts are of 25ml. And to do 1000ml the developer used is 100ml. The same amount that the midi kits "says" that have. But I only have 25 ml bottles (two of each type, ok) but if I join both, I only have 50ml of dev parts, so I can not do a 1000ml working solution, right?